Question

Simplify the expression using properties of exponents.

Answer 1

`(12a^(-9)b^(-4))/(9a^2b^6)=(12:3)/(9:3)a^(-9-2)b^(-4-6)=(4)/(3)a^(-11)b^(-10)\\\\=\boxed{(4)/(3a^(11)b^(10))}\to \boxed{B.}\\\\\text{used:}\\\\(a^n)/(a^m)=a^(n-m)\\\\a^(-n)=(1)/(a^n)`